#include "BSP.H"
#include "Pin.H"
//lint --e{750} Info 750: local macro 'XX' not referenced
///////////////////////////////////////////////////////////////////
// Communications Register (RS:000)
///////////////////////////////////////////////////////////////////
#define DRDY 0x80U // status of the DRDY
#define RS_0 ((uint8_t)0x00) // (0x00U<<4) Communications Register, 8 Bits
#define RS_1 ((uint8_t)0x10) // (0x01U<<4) Setup Register, 8 Bits
#define RS_2 ((uint8_t)0x20) // (0x02U<<4) Clock Register, 8 Bits
#define RS_3 ((uint8_t)0x30) // (0x03U<<4) Data Register, 16 Bits
#define RS_4 ((uint8_t)0x40) // (0x04U<<4) Test Register, 8 Bits
#define RS_5 ((uint8_t)0x50) // (0x05U<<4) No Operation
#define RS_6 ((uint8_t)0x60) // (0x06U<<4) Offset Register, 24 Bits
#define RS_7 ((uint8_t)0x70) // (0x07U<<4) Gain Register, 24 Bits
#define READ 0x08U // Read/Write Select
#define STBY 0x04U // Standby
#define CH_0 ((uint8_t)0x00) // 7705: AIN1(+) AIN1(-), 7706: AIN1 COMMON
#define CH_1 ((uint8_t)0x01) // 7705: AIN2(+) AIN2(-), 7706: AIN2 COMMON
#define CH_2 ((uint8_t)0x02) // 7705: AIN1(-) AIN1(-), 7706: COMMON COMMON
#define CH_3 ((uint8_t)0x03) // 7705: AIN1(-) AIN2(-), 7706: AIN3 COMMON
///////////////////////////////////////////////////////////////////
// Setup Register (RS:001)
///////////////////////////////////////////////////////////////////
#define FSYNC ((uint8_t)0x01) // Filter Synchronization
#define BUF ((uint8_t)0x02) // Buffer Control
#define B_U ((uint8_t)0x04) // 0: Bipolar Operation, 1: Unipolar Operation
#define BIPOLAR 0x00u
#define UNIPOLAR 0x04u
#define MD_0 ((uint8_t)0x00) // Normal Mode
#define MD_1 ((uint8_t)0x40) // Self-Calibration
#define MD_2 ((uint8_t)0x80) // Zero-Scale System Calibration
#define MD_3 ((uint8_t)0xC0) // Full-Scale System Calibration
#define G_0 ((uint8_t)0x00) // Gain = 1 (0x00u<<3)
#define G_1 ((uint8_t)0x08) // Gain = 2 (0x01u<<3)
#define G_2 ((uint8_t)0x10) // Gain = 4 (0x02u<<3)
#define G_3 ((uint8_t)0x18) // Gain = 8 (0x03u<<3)
#define G_4 ((uint8_t)0x20) // Gain = 16 (0x04u<<3)
#define G_5 ((uint8_t)0x28) // Gain = 32 (0x05u<<3)
#define G_6 ((uint8_t)0x30) // Gain = 64 (0x06u<<3)
#define G_7 ((uint8_t)0x38) // Gain = 128 (0x07u<<3)
///////////////////////////////////////////////////////////////////
// Clock Register (RS:010)
///////////////////////////////////////////////////////////////////
#define CLKDIS ((uint8_t)0x10) // Master Clock Disable Bit
#define CLKDIV ((uint8_t)0x08) // Clock Divider Bit
#define CLK ((uint8_t)0x04) // Clock Bit.
#define FS_0_0 ((uint8_t)0x00) // Code = 391, 19.98@1MHz
#define FS_0_1 ((uint8_t)0x01) // Code = 312, 25.04@1MHz
#define FS_0_2 ((uint8_t)0x02) // Code = 78, 100.2@1MHz
#define FS_0_3 ((uint8_t)0x03) // Code = 39, 200.3@1MHz
#define FS_1_0 ((uint8_t)0x04) // Code = 384, 50.0 @2.4576MHz
#define FS_1_1 ((uint8_t)0x05) // Code = 320, 60.0 @2.4576MHz
#define FS_1_2 ((uint8_t)0x06) // Code = 77, 249.4@2.4576MHz
#define FS_1_3 ((uint8_t)0x07) // Code = 38, 505.3@2.4576MHz
///////////////////////////////////////////////////////////////////
#define AD7705_Shift_In() (uint8_t)bus_SPIxShift(0xFFu)/*TODEL*/
#define AD7705_Shift_Out(_cout) ( void )bus_SPIxShift(_cout)
///////////////////////////////////////////////////////////////////
// AD7705 访问控制接口
///////////////////////////////////////////////////////////////////
static const uint8_t Cfg7705[CS7705_Max][2] =
{
{
BIPOLAR + G_5 + BUF, // C1H0: pf
BIPOLAR + G_4 + BUF, // C1H1: pr
},
{
BIPOLAR + G_5 + BUF, // C2H0: pf
BIPOLAR + G_4 + BUF, // C2H1: pr
},
{
BIPOLAR + G_5 + BUF, // C3H0: pf
BIPOLAR + G_4 + BUF, // C3H1: pr
}
,
{
BIPOLAR + G_5 + BUF, // C4H0: pf
BIPOLAR + G_4 + BUF, // C4H1: pr
}
,
{
BIPOLAR + G_5 + BUF, // C5H0: pf
BIPOLAR + G_4 + BUF, // C5H1: pr
}
};
uint8_t SetBuf[CS7705_Max][12];
void ConfigureRead( enum enumCS7705 cs, uint8_t xs )
{
uint8_t iRetry;
for ( iRetry = 10u; iRetry != 0u; --iRetry )
{
uint8_t ReadyState;
Select7705( cs );
delay( 1u );
AD7705_Shift_Out( RS_0 + READ + xs );
ReadyState = AD7705_Shift_In();
Select7705( CS7705_none ); // DeSelect All
if ( 0x00u == ( ReadyState & DRDY ))
{
Select7705( cs );
AD7705_Shift_Out( RS_6 + READ + xs );
SetBuf[cs][0 + 6 * xs] = AD7705_Shift_In();
SetBuf[cs][1 + 6 * xs] = AD7705_Shift_In();
SetBuf[cs][2 + 6 * xs] = AD7705_Shift_In();
Select7705( CS7705_none ); // DeSelect All
delay( 1u );
break; // done.
}
delay( 10u );
}
for ( iRetry = 10u; iRetry != 0u; --iRetry )
{
uint8_t ReadyState;
Select7705( cs );
delay( 1u );
AD7705_Shift_Out( RS_0 + READ + xs );
ReadyState = AD7705_Shift_In();
Select7705( CS7705_none ); // DeSelect All
if ( 0x00u == ( ReadyState & DRDY ))
{
Select7705( cs );
AD7705_Shift_Out( RS_7 + READ + xs );
SetBuf[cs][3 + 6 * xs] = AD7705_Shift_In();
SetBuf[cs][4 + 6 * xs] = AD7705_Shift_In();
SetBuf[cs][5 + 6 * xs] = AD7705_Shift_In();
Select7705( CS7705_none ); // DeSelect All
delay( 1u );
break; // done.
}
delay( 10u );
}
}
void ConfigureWrite( enum enumCS7705 cs, uint8_t xs )
{
AD7705_Shift_Out( RS_6 + xs );
AD7705_Shift_Out( SetBuf[cs][0 + 6 * xs] );
AD7705_Shift_Out( SetBuf[cs][1 + 6 * xs] );
AD7705_Shift_Out( SetBuf[cs][2 + 6 * xs] );
AD7705_Shift_Out( RS_7 + xs );
AD7705_Shift_Out( SetBuf[cs][3 + 6 * xs] );
AD7705_Shift_Out( SetBuf[cs][4 + 6 * xs] );
AD7705_Shift_Out( SetBuf[cs][5 + 6 * xs] );
}
/**
* 对指定的通道进行转换。回读配置供主程序判断7705是否工作正常。
*/
static uint8_t _Convert7705( uint8_t mode_set, uint8_t xs )
{
uint8_t mode_readback;
AD7705_Shift_Out( xs + RS_1 ); // 切换到指定的采样通道
AD7705_Shift_Out( mode_set ); // 以指定的配置进行采样
AD7705_Shift_Out( xs + RS_2 ); // Clock Register, 8 Bits
AD7705_Shift_Out( CLKDIV + FS_1_0 ); // 50Hz [url=home.php?mod=space&uid=72445]@[/url] 4.9152MHz
AD7705_Shift_Out( xs + RS_4 ); // Test Register, 8 Bits
AD7705_Shift_Out( 0x00u ); // Default: 0x00
AD7705_Shift_Out( xs + RS_3 + READ ); // 读取数据以复位 DRDY#
(void)AD7705_Shift_In();
(void)AD7705_Shift_In();
AD7705_Shift_Out( xs + RS_1 + READ ); // 回读配置
mode_readback = AD7705_Shift_In();
return mode_readback;
}
bool Convert7705( enum enumCS7705 cs, uint8_t xs )
{
const uint8_t mode_set = MD_0 + Cfg7705[cs][xs];
uint8_t mode_readback;
Select7705( cs );
delay( 1u );
ConfigureWrite( cs, xs );
mode_readback = _Convert7705( mode_set, xs );
Select7705( CS7705_none );
delay( 1u );
if ( mode_set == mode_readback )
{
return true; // 工作正常
}
else
{
return false; // 工作有问题，没焊?!
}
}
uint16_t Readout7705( enum enumCS7705 cs, uint8_t xs )
{
uint16_t Result = 0u;
uint8_t iRetry;
for ( iRetry = 20u; iRetry != 0u; --iRetry )
{
uint8_t ReadyState;
Select7705( cs );
delay( 1u );
AD7705_Shift_Out( RS_0 + READ + xs );
ReadyState = AD7705_Shift_In();
Select7705( CS7705_none ); // DeSelect All
if ( 0x00u == ( ReadyState & DRDY ))
{ // is DRDY# ?
uint8_t ResultH, ResultL;
Select7705( cs ); // DeSelect All
AD7705_Shift_Out( RS_3 + READ + xs ); // Read.
ResultH = AD7705_Shift_In();
ResultL = AD7705_Shift_In();
Result = ( ResultL + ( ResultH * 0x100u ));
Select7705( CS7705_none ); // DeSelect All
delay( 1u );
break; // done.
}
delay( 20u );
}
return Result;
}
void Initialize7705( void )
{
uint8_t i;
for ( i = 0u; i < CS7705_Max; ++i )
{
Select7705( i );
delay( 1u );
// Synchronization.
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
AD7705_Shift_Out( 0xFFu );
// 启动指定通道的自校准转换
_Convert7705( MD_1 + Cfg7705[i][1], 1u );
delay( 1u );
Select7705( CS7705_none );
}
delay( 220u );
for ( i = 0u; i < CS7705_Max; ++i )
{
ConfigureRead( (enum enumCS7705) i, 1u );
}
for ( i = 0u; i < CS7705_Max; ++i )
{
Select7705( i );
delay( 1u );
// 启动指定通道的自校准转换
_Convert7705( MD_1 + Cfg7705[i][0], 0u );
delay( 1u );
Select7705( CS7705_none );
}
delay( 220u );
for ( i = 0u; i < CS7705_Max; ++i )
{
ConfigureRead( (enum enumCS7705) i, 0u );
}
}
楼主
，如果只初始化一次，主循环只读取数据的话，得到的数据就是错误+正确+错误+正确.........这样。
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